| Re: Plotting double precision [message #19105] |
Thu, 24 February 2000 00:00  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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davidf@dfanning.com (David Fanning) writes:
> Investigate some of the keywords
> that are available for the PLOT command. I would start with
> [XYZ]Tickname, [XYZ]TickV, and maybe [XYZ]Tickformat.
Yeah, and welcome to another planet of hurt. David is right though.
The best solution is to scale your data and then label the axes
yourself. Personally, I think it's actually cleaner to scale your
data by 10^(-39), and then put that in the "units" of your x/ytitle.
I've also encountered the single-precision-plotting problem when I am
plotting numbers with X = X0*(1+d) where d is very small. When d/X0
becomes smaller than about 1 in a million, you can see a noticeable
staircase effect on the plot, since single precision can't preserve
the fidelity. My only solution has been to subtract and rescale the
data.
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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